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Finding the Fourth Proportional to 81,117.84, 121,683.15 and 28,539.12

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Solution

The fourth proportional to 81,117.84, 121,683.15 and 28,539.12 is: 42,810.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,117.84 : 121,683.15 = 28,539.12 : x
  2. Step 2: Convert to fraction form
    81,117.84/121,683.15 = 28,539.12/x
  3. Step 3: Cross multiply
    81,117.84x = 121,683.15 × 28,539.12
  4. Step 4: Simplify right side
    81,117.84x = 3,472,730,019.83
  5. Step 5: Solve for x
    x = 3,472,730,019.83/81,117.84
  6. Step 6: Final answer
    x = 42,810.93

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